On your download site (https://www.sandboxie.com/AllVersions) only MD5 and SHA1 checksum are available.
Both are broken so please provide SHA2-512 and SHA3 instead of weak MD5 and SHA1.

And to verify the files are realy from you, provide GPG.asc signature for binarys with GPG ID & fingerprint so we can check that.
Sandboxie is a important security software so it need important secure ways to verify the integrity

And MD5 is even worse:
The security of the MD5 has been severely compromised, with its weaknesses having been exploited in the field, most infamously by the Flame malware in 2012. The CMU Software Engineering Institute considers MD5 essentially "cryptographically broken and unsuitable for further use".[4] Despite this known vulnerability, MD5 remains in use.
A 2013 attack by Xie Tao, Fanbao Liu, and Dengguo Feng breaks MD5 collision resistance in 218 time. This attack runs in less than a second on a regular computer.[2]
MD5 is prone to length extension attacks.

Is that enough? I dont understand why you dont know that nor just use stronger checksums

It looks like you are talking about a general issue with SHAs / MD5, but you are not reporting anything broken with the ones currently posted. I thought you had examples to provide about incorrect info provided on our end, sorry about any confusion.

I have already replied to the other portion on my first response.
I will update this thread if new information becomes available.